Strain enhanced spin polarization in graphene with Rashba spin-orbit coupling and exchange effects
Strain enhanced spin polarization in graphene with Rashba spin-orbit coupling and exchange effects
复制标题
DOI：
10.1063/1.3679568
复制
发表时间：
2012-02
影响因子：
3.2
通讯作者：
Ying-Tao Zhang;F. Zhai
中科院分区：
文献类型：
--
作者：
Ying-Tao Zhang;F. Zhai
我们研究了在交换分裂场、赝磁场和Rashba自旋轨道耦合（SOC）存在下，块状石墨烯中的自旋极化和谷依赖输运。结果表明，Rashba SOC和赝磁场不能产生垂直于石墨烯片的自旋极化分量，但交换场可以。然而，Rashba SOC导致有限的面内自旋极化，这可以由赝磁场调制。此外，还证明了谷极化电流不能在所考虑的系统中产生，由于谷K和K′的透射概率的镜像对称性。
We investigate spin polarization and valley-dependent transport in bulk graphene in the presence of the exchange splitting field, the pseudo magnetic field, and Rashba spin-orbit coupling (SOC). It is demonstrated that Rashba SOC and the pseudo magnetic field cannot produce a spin polarization component perpendicular to the graphene sheet, but the exchange field can. However, the Rashba SOC leads to a finite in-plane spin polarization, which can be modulated by the pseudo magnetic field. Furthermore, it is also demonstrated that the valley polarization current cannot be produced in the considered system due to the mirror symmetry property of transmission probability for valley K and K′.